/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics;

//Need the following import to get access to the app resources, since this
//class is in a sub-package.
import com.example.android.apis.R;

import android.app.Activity;
import android.os.Bundle;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.ScrollView;
import android.view.LayoutInflater;
import android.view.View;
import android.content.Context;
import android.util.DisplayMetrics;
import android.util.Log;

/**
 * This activity demonstrates various ways density can cause the scaling of
 * bitmaps and drawables.
 */
public class DensityActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		final LayoutInflater li = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);

		this.setTitle(R.string.density_title);
		LinearLayout root = new LinearLayout(this);
		root.setOrientation(LinearLayout.VERTICAL);

		LinearLayout layout = new LinearLayout(this);
		addBitmapDrawable(layout, R.drawable.logo120dpi, true);
		addBitmapDrawable(layout, R.drawable.logo160dpi, true);
		addBitmapDrawable(layout, R.drawable.logo240dpi, true);
		addLabelToRoot(root, "Prescaled bitmap in drawable");
		addChildToRoot(root, layout);

		layout = new LinearLayout(this);
		addBitmapDrawable(layout, R.drawable.logo120dpi, false);
		addBitmapDrawable(layout, R.drawable.logo160dpi, false);
		addBitmapDrawable(layout, R.drawable.logo240dpi, false);
		addLabelToRoot(root, "Autoscaled bitmap in drawable");
		addChildToRoot(root, layout);

		layout = new LinearLayout(this);
		addResourceDrawable(layout, R.drawable.logo120dpi);
		addResourceDrawable(layout, R.drawable.logo160dpi);
		addResourceDrawable(layout, R.drawable.logo240dpi);
		addLabelToRoot(root, "Prescaled resource drawable");
		addChildToRoot(root, layout);

		layout = (LinearLayout) li.inflate(R.layout.density_image_views, null);
		addLabelToRoot(root, "Inflated layout");
		addChildToRoot(root, layout);

		layout = (LinearLayout) li.inflate(R.layout.density_styled_image_views,
				null);
		addLabelToRoot(root, "Inflated styled layout");
		addChildToRoot(root, layout);

		layout = new LinearLayout(this);
		addCanvasBitmap(layout, R.drawable.logo120dpi, true);
		addCanvasBitmap(layout, R.drawable.logo160dpi, true);
		addCanvasBitmap(layout, R.drawable.logo240dpi, true);
		addLabelToRoot(root, "Prescaled bitmap");
		addChildToRoot(root, layout);

		layout = new LinearLayout(this);
		addCanvasBitmap(layout, R.drawable.logo120dpi, false);
		addCanvasBitmap(layout, R.drawable.logo160dpi, false);
		addCanvasBitmap(layout, R.drawable.logo240dpi, false);
		addLabelToRoot(root, "Autoscaled bitmap");
		addChildToRoot(root, layout);

		layout = new LinearLayout(this);
		addResourceDrawable(layout, R.drawable.logonodpi120);
		addResourceDrawable(layout, R.drawable.logonodpi160);
		addResourceDrawable(layout, R.drawable.logonodpi240);
		addLabelToRoot(root, "No-dpi resource drawable");
		addChildToRoot(root, layout);

		layout = new LinearLayout(this);
		addNinePatchResourceDrawable(layout, R.drawable.smlnpatch120dpi);
		addNinePatchResourceDrawable(layout, R.drawable.smlnpatch160dpi);
		addNinePatchResourceDrawable(layout, R.drawable.smlnpatch240dpi);
		addLabelToRoot(root, "Prescaled 9-patch resource drawable");
		addChildToRoot(root, layout);

		setContentView(scrollWrap(root));
	}

	private View scrollWrap(View view) {
		ScrollView scroller = new ScrollView(this);
		scroller.addView(view, new ScrollView.LayoutParams(
				ScrollView.LayoutParams.MATCH_PARENT,
				ScrollView.LayoutParams.MATCH_PARENT));
		return scroller;
	}

	private void addLabelToRoot(LinearLayout root, String text) {
		TextView label = new TextView(this);
		label.setText(text);
		root.addView(label, new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.MATCH_PARENT,
				LinearLayout.LayoutParams.WRAP_CONTENT));
	}

	private void addChildToRoot(LinearLayout root, LinearLayout layout) {
		root.addView(layout, new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.MATCH_PARENT,
				LinearLayout.LayoutParams.WRAP_CONTENT));
	}

	private void addBitmapDrawable(LinearLayout layout, int resource,
			boolean scale) {
		Bitmap bitmap;
		bitmap = loadAndPrintDpi(resource, scale);

		View view = new View(this);

		final BitmapDrawable d = new BitmapDrawable(getResources(), bitmap);
		if (!scale)
			d.setTargetDensity(getResources().getDisplayMetrics());
		view.setBackgroundDrawable(d);

		view.setLayoutParams(new LinearLayout.LayoutParams(d
				.getIntrinsicWidth(), d.getIntrinsicHeight()));
		layout.addView(view);
	}

	private void addResourceDrawable(LinearLayout layout, int resource) {
		View view = new View(this);

		final Drawable d = getResources().getDrawable(resource);
		view.setBackgroundDrawable(d);

		view.setLayoutParams(new LinearLayout.LayoutParams(d
				.getIntrinsicWidth(), d.getIntrinsicHeight()));
		layout.addView(view);
	}

	private void addCanvasBitmap(LinearLayout layout, int resource,
			boolean scale) {
		Bitmap bitmap;
		bitmap = loadAndPrintDpi(resource, scale);

		ScaledBitmapView view = new ScaledBitmapView(this, bitmap);

		view.setLayoutParams(new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.WRAP_CONTENT,
				LinearLayout.LayoutParams.WRAP_CONTENT));
		layout.addView(view);
	}

	private void addNinePatchResourceDrawable(LinearLayout layout, int resource) {
		View view = new View(this);

		final Drawable d = getResources().getDrawable(resource);
		view.setBackgroundDrawable(d);

		Log.i("foo",
				"9-patch #" + Integer.toHexString(resource) + " w="
						+ d.getIntrinsicWidth() + " h="
						+ d.getIntrinsicHeight());
		view.setLayoutParams(new LinearLayout.LayoutParams(d
				.getIntrinsicWidth() * 2, d.getIntrinsicHeight() * 2));
		layout.addView(view);
	}

	private Bitmap loadAndPrintDpi(int id, boolean scale) {
		Bitmap bitmap;
		if (scale) {
			bitmap = BitmapFactory.decodeResource(getResources(), id);
		} else {
			BitmapFactory.Options opts = new BitmapFactory.Options();
			opts.inScaled = false;
			bitmap = BitmapFactory.decodeResource(getResources(), id, opts);
		}
		return bitmap;
	}

	private class ScaledBitmapView extends View {
		private Bitmap mBitmap;

		public ScaledBitmapView(Context context, Bitmap bitmap) {
			super(context);
			mBitmap = bitmap;
		}

		@Override
		protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
			super.onMeasure(widthMeasureSpec, heightMeasureSpec);
			final DisplayMetrics metrics = getResources().getDisplayMetrics();
			setMeasuredDimension(mBitmap.getScaledWidth(metrics),
					mBitmap.getScaledHeight(metrics));
		}

		@Override
		protected void onDraw(Canvas canvas) {
			super.onDraw(canvas);

			canvas.drawBitmap(mBitmap, 0.0f, 0.0f, null);
		}
	}
}
